CN103066814B - A kind of isolated drive circuit - Google Patents

A kind of isolated drive circuit Download PDF

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Publication number
CN103066814B
CN103066814B CN201110325112.0A CN201110325112A CN103066814B CN 103066814 B CN103066814 B CN 103066814B CN 201110325112 A CN201110325112 A CN 201110325112A CN 103066814 B CN103066814 B CN 103066814B
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Prior art keywords
power switch
circuit
switch pipe
side winding
diode
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CN201110325112.0A
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CN103066814A (en
Inventor
李俊凯
郑大成
万正海
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ZTE Corp
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ZTE Corp
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Priority to CN201110325112.0A priority Critical patent/CN103066814B/en
Priority to PCT/CN2012/076843 priority patent/WO2013060145A1/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/08Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/08Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
    • H03K17/689Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors with galvanic isolation between the control circuit and the output circuit
    • H03K17/691Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors with galvanic isolation between the control circuit and the output circuit using transformer coupling
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/06Modifications for ensuring a fully conducting state
    • H03K2017/066Maximizing the OFF-resistance instead of minimizing the ON-resistance

Abstract

The invention discloses a kind of isolated drive circuit, relate to a kind of isolated drive circuit being applied to Switching Power Supply power switch pipe, particularly relate to a kind of isolated drive circuit needing two-way complementary, including: for producing the control circuit of drive pulse signal;There is the isolation drive transformator of a primary side winding, one or more vice-side winding;Connect the capacitance of the primary side winding of described control circuit and described isolation drive transformator;Also include being connected between vice-side winding and the power switch pipe of described isolation drive transformator for the drive circuit making power switch pipe turn on, the bleed-off circuit making power switch pipe turn off and turn-off circuit.The present invention can make power switch pipe reliable turn-off, and can control the power consumption producing to drive the control circuit of pulse width signal, the advantage both having remained conventional driving circuit, solves again conventional driving circuit Problems existing.

Description

A kind of isolated drive circuit
Technical field
The present invention relates to a kind of isolated drive circuit being applied to Switching Power Supply power switch pipe, particularly relate to a kind of isolated drive circuit needing two-way complementary.
Background technology
The scheme of Switching Power Supply is widely used, and its Primary Component power switch pipe is operated under high-frequency and high-voltage state.Needs due to circuit topology itself or the consideration based on secure context, it is necessary to the drive pulse signal from control circuit is isolated with power switch pipe.
Fig. 1 shows a kind of traditional isolated drive circuit figure that prior art provides, as it is shown in figure 1, be the isolated drive circuit of power switch pipe in broken box, including former limit capacitance C1, isolation drive transformator T1, secondary bootstrap capacitor C2, bootstrap diode D1.
When driving pulse is opened, driving pulse from control circuit is added between A point and B point, and now the voltage direction of the former vice-side winding of isolation drive transformator T1 is upper just lower negative, after isolated variable, negative pressure bootstrapping, C point and with reference to export, be used for drive power switch pipe Qsw1。
When driving pulse turns off, A point voltage is identical with B point voltage.Capacitance C1 forces the primary side winding of isolation drive transformator T1 and vice-side winding voltage to change direction, under namely above bearing just.Isolation drive transformator T1 constitutes path by vice-side winding with bootstrap diode D1 and bootstrap capacitor C2, it is achieved magnetic reset.Now C point voltage is 0V, power switch pipe Qsw1 turns off.Due to power switch pipe Qsw1 is usually MOSFET pipe, and the unlatching threshold values of MOSFET pipe is low, when there being electromagnetic distu, and power switch pipe Qsw1 again can be wrong open-minded when turning off, thus reducing the reliability of whole switch power supply system.
Fig. 2 shows traditional isolated drive circuit figure of a kind of complementation that prior art provides, as shown in Figure 2, it is complementary isolated drive circuit in broken box, drives resistance R1, R2, diode D1, D2 including former limit capacitance C1, isolation drive transformator T1 and secondary.
When being added between A point and B point from the positive drive pulse signal of control circuit, the voltage direction of the primary side winding Lp of isolation drive transformator T1 is upper just lower negative, pass through isolated variable, the voltage direction of the vice-side winding Ls1 of isolation drive transformator T1 is upper just lower negative, the voltage direction of the vice-side winding Ls2 of isolation drive transformator be upper negative under just, positive pulse signal is exported between C point and D point, power switch pipe Qsw1 is kept reliably to turn on, between E point and F point, export undersuing, keep power switch pipe Qsw2 reliable turn-off.
When being added between A point and B point from the negative driving pulse of control circuit, the voltage direction of the primary side winding Lp of isolation drive transformator T1 be upper negative under just, pass through isolated variable, the voltage direction of the vice-side winding Ls1 of isolation drive transformator T1 be upper negative under just, the voltage direction of the vice-side winding Ls2 of isolation drive transformator is upper just lower negative, between C point and D point, export undersuing, keep power switch pipe Qsw1 reliable turn-off, exports positive pulse signal between E point and F point, keeps power switch pipe Qsw2 reliably turn on.
This circuit can solve the abnormal operation that isolated drive circuit traditional described in Fig. 1 causes because of poor working environment.But, owing to this circuit is by driving the undersuing that signal amplitude is identical to keep the reliable turn-off of power switch pipe with positive pulse, the control circuit power consumption therefore resulting in driving pulse is big, and heating is serious.
Summary of the invention
It is an object of the invention to provide a kind of isolated drive circuit, be used for overcoming control circuit power consumption big, serious problem of generating heat.
According to an aspect of the present invention, a kind of isolated drive circuit provided by the invention includes:
For producing the control circuit of drive pulse signal;
There is the isolation drive transformator of a primary side winding, one or more vice-side winding;
Connect the capacitance of the primary side winding of described control circuit and described isolation drive transformator;
Described isolated drive circuit also includes:
Be connected between vice-side winding and the power switch pipe of described isolation drive transformator for the drive circuit making power switch pipe turn on, the bleed-off circuit making power switch pipe turn off and turn-off circuit.
Described drive circuit includes the driving resistance and the driving diode that are connected in series with the vice-side winding of described isolation drive transformator.
Further, the anode of described driving diode connects one end of described power switch pipe via described vice-side winding, and negative electrode connects the other end of described power switch pipe via described driving resistance.
Further, the anode of described driving diode connects one end of described power switch pipe successively via described driving resistance and described vice-side winding, and its negative electrode connects the other end of described power switch pipe.
Further, the anode of described driving diode connects one end of described power switch pipe successively via described vice-side winding and described driving resistance, and its negative electrode connects the other end of described power switch pipe.
Described bleed-off circuit includes:
Release P type switching tube;
Bleeder resistance, the emitter stage of P type switching tube of releasing described in the connection of one end, one end connects one end of power switch pipe;
Release diode, its anode connect described in release the colelctor electrode of P type switching tube, its negative electrode connects the other end of power switch pipe.
Described turn-off circuit includes:
Turn off diode;
First divider resistance, its one end connects the anode of described shutoff diode via vice-side winding, the base stage of P type switching tube of releasing described in the connection of its other end;
Second divider resistance, its one end connects the negative electrode of described shutoff diode, and its other end is via the emitter stage of P type switching tube of releasing described in the connection of described bleeder resistance;
Wherein, the anode of described shutoff diode connects one end of power switch pipe, and negative electrode connects the other end of power switch pipe via the second divider resistance.
Described turn-off circuit also includes:
First anti-saturation diode, its anode connects the base stage of P type switching tube of releasing, and its negative electrode connects the first divider resistance;
Second anti-saturation diode, its anode connects the colelctor electrode of P type switching tube of releasing, and its negative electrode connects the negative electrode of the first anti-saturation diode.
Further, P type switching tube of releasing described in is PNP triode or P type multiple tube.
Compared with prior art, the beneficial effects of the present invention is:
1, the present invention is by regulating the resistance distribution of the divider resistance of turn-off circuit, controls power switch pipe and keeps the amplitude of negative pressure when off, thus controlling the power consumption of described control circuit;
2, present invention preserves the capacitance on former limit, it is possible to making driving transformer primary side winding reset with very stable voltage, the output waveform of isolated drive circuit is without spine and concussion.
3, the present invention can seal in anti-saturation device in turn-off circuit, namely increases anti-saturation diode, it is prevented that described P type switching tube penetration depth of releasing is saturated.
4, the present invention is not limited to single channel isolation drive, it is also possible to for multichannel isolation drive, especially two-way complementation isolation drive.
In a word, the present invention had both remained the advantage of tradition isolated drive circuit, solved again tradition isolated drive circuit Problems existing.
Accompanying drawing explanation
Fig. 1 is a kind of traditional isolated drive circuit figure that prior art provides;
Fig. 2 is traditional isolated drive circuit figure of a kind of complementation that prior art provides;
Fig. 3 is the first the connected mode figure of the drive circuit that the embodiment of the present invention provides;
Fig. 4 is the second connected mode figure of the drive circuit that the embodiment of the present invention provides;
Fig. 5 is the third the connected mode figure of the drive circuit that the embodiment of the present invention provides;
Fig. 6 is the first the connected mode figure of the bleed-off circuit that the embodiment of the present invention provides;
Fig. 7 is the second connected mode figure of the bleed-off circuit that the embodiment of the present invention provides;
Fig. 8 is the connected mode figure of the turn-off circuit that the embodiment of the present invention provides;
Fig. 9 is the connected mode figure of the turn-off circuit increasing anti-saturation that the embodiment of the present invention provides;
Figure 10 is the structure chart of the single channel isolated drive circuit that the embodiment of the present invention provides;
Figure 11 is the structure chart of the multichannel isolated drive circuit that the embodiment of the present invention provides;
Figure 12 is the structure chart of the two-way complementation isolated drive circuit that the embodiment of the present invention provides;
Figure 13 is a kind of isolated drive circuit figure that the embodiment of the present invention provides;
Figure 14 is the another kind of isolated drive circuit figure that the embodiment of the present invention provides.
Detailed description of the invention
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail, it will be appreciated that preferred embodiment described below is merely to illustrate and explains the present invention, is not limited to the present invention.
The invention aims to overcome in prior art, by driving the negative pulse that signal amplitude is identical to drive signal to keep power switch pipe reliable turn-off with positive pulse, thus causing that the power consumption of the control circuit of driving pulse is big, serious problem of generating heat.
A kind of isolated drive circuit provided by the invention includes:
Produce the control circuit of drive pulse signal;
There is the isolation drive transformator of a primary side winding, one or more vice-side winding;
It is connected to the capacitance between the primary side winding of described control circuit and described isolation drive transformator;
Described isolated drive circuit also includes:
Be connected between vice-side winding and the power switch pipe of described isolation drive transformator for the drive circuit making power switch pipe turn on, the bleed-off circuit making power switch pipe turn off and turn-off circuit.
Described drive circuit includes:
The driving resistance being connected in series with the vice-side winding of described isolation drive transformator and driving diode.
Described bleed-off circuit includes:
Release P type switching tube;
Bleeder resistance, the emitter stage of P type switching tube of releasing described in the connection of one end, one end connects one end of power switch pipe;
Release diode, its anode connect described in release the colelctor electrode of P type switching tube, its negative electrode connects the other end of power switch pipe.
Described turn-off circuit includes:
Turn off diode;
First divider resistance, its one end connects the anode of described shutoff diode via vice-side winding, the base stage of P type switching tube of releasing described in the connection of its other end;
Second divider resistance, its one end connects the negative electrode of described shutoff diode, and its other end is via the emitter stage of P type switching tube of releasing described in the connection of described bleeder resistance;
Wherein, the anode of described shutoff diode connects one end of power switch pipe, and negative electrode connects the other end of power switch pipe via the second divider resistance.
Described turn-off circuit also includes:
First anti-saturation diode, its anode connects the base stage of P type switching tube of releasing, and its negative electrode connects the first divider resistance;
Second anti-saturation diode, its anode connects the colelctor electrode of P type switching tube of releasing, and its negative electrode connects the negative electrode of the first anti-saturation diode.
Further, P type switching tube of releasing described in is PNP triode or P type multiple tube.
Fig. 3 to Fig. 5 shows the connected mode of the drive circuit that the embodiment of the present invention provides, and described drive circuit is used for making power switch pipe keep open-minded, by driving diode, driving transformer vice-side winding and driving resistant series to form.The device in this loop has multiple connected mode, in its structure such as Fig. 3, Fig. 4, Fig. 5 shown in bold portion, drives power switch pipe with the voltage between C point and D point.
As it is shown on figure 3, the anode of described driving diode connects one end (D point side) of described power switch pipe via described vice-side winding, negative electrode connects the other end (C point side) of described power switch pipe via described driving resistance.
As shown in Figure 4, the anode of described driving diode connects one end (D point side) of described power switch pipe successively via described driving resistance and described vice-side winding, and its negative electrode connects the other end (C point side) of described power switch pipe.
As it is shown in figure 5, the anode of described driving diode connects one end (D point side) of described power switch pipe successively via described vice-side winding and described driving resistance, its negative electrode connects the other end (C point side) of described power switch pipe.
Fig. 6 and Fig. 7 shows the connected mode of the bleed-off circuit that the embodiment of the present invention provides, described bleed-off circuit is used for making power switch pipe turn off, by bleeder resistance, release diode and P type switching tube of releasing is composed in series, the device in this loop has multiple connected mode, in its structure such as Fig. 6 and Fig. 7 shown in bold portion, drive power switch pipe with the voltage between C point and D point.
As shown in Figure 6, described bleed-off circuit includes the bleeder resistance being sequentially connected in series, release P type switching tube and diode of releasing.Releasing the emitter stage of P type switching tube described in connecting in described bleeder resistance one end, one end connects one end (C point side) of power switch pipe.Described diode of releasing, the colelctor electrode of P type switching tube of releasing described in the connection of its anode, its negative electrode connects the other end (D point side) of power switch pipe.
Drive circuit shown in Fig. 6 have employed the connected mode shown in Fig. 5, and now, one end that described bleeder resistance is connected with power switch pipe is also connected with the negative electrode driving diode.
As shown in Figure 7, the link position of bleeder resistance described in figure is different from Fig. 6, still adopting the connected mode shown in Fig. 5 for the drive circuit shown in Fig. 7, in Fig. 7, one end that described bleeder resistance is connected with the emitter stage of the described P of releasing type switching tube is also connected with the negative electrode driving diode.
Fig. 8 shows the connected mode of the turn-off circuit that the embodiment of the present invention provides, and described turn-off circuit is used for making power switch pipe keep certain negative voltage, it is ensured that power switch pipe reliable turn-off.Described turn-off circuit is made up of the first divider resistance, the second divider resistance, bleeder resistance, shutoff diode, P type switching tube series connection etc. of releasing, Fig. 8 bold portion is the structure of described turn-off circuit, drives power switch pipe with the voltage between C point and D point.Wherein:
First divider resistance, its one end connects the anode of described shutoff diode via vice-side winding, the base stage of P type switching tube of releasing described in the connection of its other end;
Second divider resistance, its one end connects the negative electrode of described shutoff diode, and its other end is via the emitter stage of P type switching tube of releasing described in the connection of described bleeder resistance;
Turning off diode, its anode connects one end of power switch pipe, and negative electrode connects the other end of power switch pipe via the second divider resistance.
Going deep into saturated in order to P type switching tube of releasing described in preventing enters, the turn-off circuit shown in Fig. 8 can also seal in anti-saturation device, as it is shown in figure 9, add anti-saturation diode in the turn-off circuit shown in Fig. 8.Wherein:
First anti-saturation diode, its anode connects the base stage of P type switching tube of releasing, and its negative electrode connects the first divider resistance;
Second anti-saturation diode, its anode connects the colelctor electrode of P type switching tube of releasing, and its negative electrode connects the negative electrode of the first anti-saturation diode.
By technical solutions according to the invention, the present invention is suitable in the multichannel isolated drive circuit shown in single channel isolated drive circuit as shown in Figure 10, Figure 11, the especially two-way complementation isolated drive circuit shown in Figure 12.It is to say, isolation drive transformator can include one or more vice-side winding, each of which vice-side winding connects a secondary circuit, forms drive circuit, bleed-off circuit and turn-off circuit.
Figure 13 shows a kind of isolated drive circuit figure that the embodiment of the present invention provides, and as shown in figure 13, the present embodiment is a kind of single channel isolated drive circuit.Wherein, drive circuit have employed the connected mode shown in Fig. 3, including driving diode D1 and driving resistance R1;Bleed-off circuit have employed the connected mode shown in Fig. 6, and including bleeder resistance R3, the P type switching tube Q1 that releases, release diode D2;Turn-off circuit have employed the connected mode shown in Fig. 8, including turning off diode D3, the second divider resistance R4, the first divider resistance R2.Its operation principle is as follows:
When being added between A point and B point from the positive drive pulse signal of control circuit, by the isolated variable of isolation drive transformator T1, the voltage direction of vice-side winding Ls is upper just lower negative.Secondary current, by driving diode D1 and driving resistance R1, i.e. drive circuit, produces certain driving voltage between points c andd, drives power switch pipe.
When closing from the positive drive pulse signal of control circuit, namely entering Dead Time, isolation drive transformator T1 winding two ends do not have voltage.Voltage on power switch pipe, i.e. voltage between C point and D point, by bleeder resistance R3, release P type switching tube Q1, release diode D2, i.e. bleed-off circuit, discharge rapidly.
When being added between A point and B point from the negative drive pulse signal of control circuit, by the isolated variable of isolation drive transformator T1, the voltage direction of vice-side winding Ls be upper negative under just.Secondary current, by turning off diode D3, the second divider resistance R4, bleeder resistance R3, release P type switching tube Q1, the first divider resistance R2, i.e. turn-off circuit, produces the negative voltage of certain amplitude between points c andd, guarantees power switch pipe reliable turn-off.
Further, by regulating the resistance distribution of the first divider resistance R2 and the second divider resistance R4, it is possible to the amplitude of control negative voltage between points c andd, thus controlling the power consumption of the control circuit of driving pulse.
Figure 14 shows the another kind of isolated drive circuit figure that the embodiment of the present invention provides, and as shown in figure 14, the present embodiment is a kind of dual path isolation complementary drive circuit, and described isolation drive transformator T1 has a primary side winding Lp and two vice-side winding Ls1, Ls2.Wherein, drive circuit have employed the connected mode shown in Fig. 5, and the drive circuit of vice-side winding Ls1 side includes driving diode D1, drives the drive circuit of resistance R1, vice-side winding Ls2 side to include driving diode D4, driving resistance R5;Bleed-off circuit have employed the connected mode shown in Fig. 6, the bleed-off circuit of vice-side winding Ls1 side includes bleeder resistance R3, the P type switching tube Q1 that releases, release diode D2, and the bleed-off circuit of vice-side winding Ls2 side includes bleeder resistance R7, the P type switching tube Q2 that releases, release diode D5;Turn-off circuit have employed the connected mode shown in Fig. 8, the turn-off circuit of vice-side winding Ls1 side include turn off diode D3, the second divider resistance R4, the first divider resistance R2, vice-side winding Ls2 side turn-off circuit include turn off diode D6, the second divider resistance R8, the first divider resistance R6.Its operation principle is as follows:
When being added between A point and B point from the positive drive pulse signal of control circuit, by the isolated variable of isolation drive transformator T1, the voltage direction of vice-side winding Ls1 is upper just lower negative, and secondary current passes through drive circuit, produce driving voltage between points c andd, drive power switch pipe.The voltage direction of vice-side winding Ls2 be upper negative under just.Secondary current passes through turn-off circuit, produces certain negative voltage between e andf, guarantees to drive power switch pipe reliable turn-off.
When closing from the positive drive pulse signal of control circuit, namely entering Dead Time, transformator T1 winding two ends do not have voltage.Voltage between C point and D point is discharged rapidly by bleed-off circuit, and the voltage between E point and F point returns to zero volt by turn-off circuit.
When being added between A point and B point from the negative drive pulse signal of control circuit, isolated variable by transformator T1, the voltage direction of vice-side winding Ls1 be upper negative under just, secondary current passes through turn-off circuit, produce certain negative voltage between points c andd, guarantee power switch pipe reliable turn-off.The voltage direction of vice-side winding Ls2 is upper just lower negative, and secondary current passes through drive circuit, produces driving voltage between e andf, drives power switch pipe.
Although above the present invention being described in detail, but the invention is not restricted to this, those skilled in the art of the present technique can carry out various amendment according to principles of the invention.Therefore, all amendments made according to the principle of the invention, all should be understood to fall into protection scope of the present invention.

Claims (9)

1. an isolated drive circuit, including:
For producing the control circuit of drive pulse signal;
There is the isolation drive transformator of a primary side winding, one or more vice-side winding;
Connect the capacitance of the primary side winding of described control circuit and described isolation drive transformator;
Be connected between vice-side winding and the power switch pipe of described isolation drive transformator for the drive circuit making power switch pipe turn on, the bleed-off circuit that makes power switch pipe turn off;
It is characterized in that, also include the turn-off circuit being connected between vice-side winding and the power switch pipe of described isolation drive transformator, comprising:
Turn off diode;
First divider resistance, its one end connects the anode of described shutoff diode via vice-side winding, and its other end connects the base stage of the P type switching tube of releasing of described bleed-off circuit;
Second divider resistance, its one end connects the negative electrode of described shutoff diode, and its other end is via the emitter stage of P type switching tube of releasing described in the bleeder resistance connection of described bleed-off circuit;
Wherein, the anode of described shutoff diode connects one end of power switch pipe, and negative electrode connects the other end of power switch pipe via the second divider resistance.
2. circuit according to claim 1, it is characterised in that described drive circuit includes the driving resistance and the driving diode that are connected in series with the vice-side winding of described isolation drive transformator.
3. circuit according to claim 2, it is characterised in that the anode of described driving diode connects one end of described power switch pipe via described vice-side winding, negative electrode connects the other end of described power switch pipe via described driving resistance.
4. circuit according to claim 2, it is characterised in that the anode of described driving diode connects one end of described power switch pipe successively via described driving resistance and described vice-side winding, and its negative electrode connects the other end of described power switch pipe.
5. circuit according to claim 2, it is characterised in that the anode of described driving diode connects one end of described power switch pipe successively via described vice-side winding and described driving resistance, and its negative electrode connects the other end of described power switch pipe.
6. the circuit according to claim 1-5 any one, it is characterised in that described bleed-off circuit includes:
Described P type switching tube of releasing;
Described bleeder resistance, the emitter stage of P type switching tube of releasing described in the connection of one end, one end connects one end of power switch pipe;
Release diode, its anode connect described in release the colelctor electrode of P type switching tube, its negative electrode connects the other end of power switch pipe.
7. circuit according to claim 6, it is characterised in that described in P type switching tube of releasing be PNP triode or P type multiple tube.
8. circuit according to claim 1, it is characterised in that described turn-off circuit also includes:
First anti-saturation diode, its anode connects the base stage of P type switching tube of releasing, and its negative electrode connects the first divider resistance;
Second anti-saturation diode, its anode connects the colelctor electrode of P type switching tube of releasing, and its negative electrode connects the negative electrode of the first anti-saturation diode.
9. circuit according to claim 8, it is characterised in that described in P type switching tube of releasing be PNP triode or P type multiple tube.
CN201110325112.0A 2011-10-24 2011-10-24 A kind of isolated drive circuit Active CN103066814B (en)

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PCT/CN2012/076843 WO2013060145A1 (en) 2011-10-24 2012-06-13 An isolated driving circuit

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CN108023467A (en) * 2017-12-04 2018-05-11 山东航天电子技术研究所 A kind of two-way magnetization transformer isolation drive circuit
CN109742953B (en) * 2018-12-27 2021-02-23 广州金升阳科技有限公司 Magnetic isolation driving circuit
CN109742952B (en) * 2018-12-27 2021-02-23 广州金升阳科技有限公司 Magnetic isolation driving circuit
CN110299826B (en) * 2019-07-01 2020-11-20 上海空间电源研究所 Reliable isolation driving circuit suitable for wide duty ratio for spacecraft
CN112564458B (en) * 2019-09-10 2021-12-31 苏州捷芯威半导体有限公司 Isolation driving circuit
CN117526686A (en) * 2022-07-27 2024-02-06 华为技术有限公司 Driving circuit, control method, power module and electronic equipment

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